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Debt - 2016 Convertible Notes (Details Textual) - Senior Convertible Notes 2016 $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Tradingday $ / shares | Mar. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |
Senior convertible notes face amount | $ |  | $ 230,000
Interest rate on senior convertible notes | 4.25% | 4.25%
Maturity date of 2016 convertible Notes | Mar. 15, 2036 |
Initial conversion rate of common stock | 17.6656 |
Convertible Notes, initial conversion of Par Value Convertible Notes to common stock | $ | $ 1 |
Initial conversion price | $ / shares | $ 56.61 |
Minimum quarterly dividends to adjust conversion rate | $ / shares | $ 0.185 |
Percentage of par value of convertible notes to be settled in cash | 100.00% |
Consecutive trading days during related observation period | 40 days |
Rate of conversion price | 130.00% |
Debt instrument, convertible, threshold consecutive trading days | Tradingday | 30 |
Debt instrument, convertible, threshold trading days | Tradingday | 20 |

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